Article
Nanoscience & Nanotechnology
Iat Wai Leong, Makusu Tsutsui, Kazumichi Yokota, Sanae Murayama, Masateru Taniguchi
Summary: By using partial dielectric coatings, the nonlinear ionic current through a pore can be altered, allowing the pore to behave like a resistor, diode, and bipolar junction transistor. The reasons for asymmetric ion transport in the pore and the relationship between specifically charged surfaces and electroosmotic flow are revealed through numerical simulations. These findings provide a direct approach to modify the electroosmotic-flow-driven ionic current rectification in channel-based devices via dielectric coatings.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Analytical
Ruben Banos, Jose Arcos, Oscar Bautista, Federico Mendez
Summary: This paper investigates the combined effect of fluid rheology, finite-sized ions, and slippage on enhancing mass transport of a non-reacting solute due to oscillatory electroosmotic flow. Mathematical models were used to predict the behavior of ions and fluids in microchannels under different conditions, showing significant enhancement in mass transport with appropriate choices of parameters.
Article
Chemistry, Analytical
Niu Feng, Xuewen Peng, Zhipan Wang, Xiaoping Yu, Xuping Shentu, Yiping Chen
Summary: Pursuing convenient operations and precise testing has become an urgent requirement in clinical diagnosis, treatment, and prognosis. This study constructed a label-free electroosmotic flow-driven microchannel (LF-EMB) biosensor based on the dual properties of highly selective antibody-antigen recognition and potential signaling of biomolecules. The LF-EMB demonstrated outstanding sensitivity and detection speed, providing a convenient option for the quantitative detection of inflammatory markers and antibiotics.
ANALYTICAL CHEMISTRY
(2022)
Article
Engineering, Mechanical
R. D. Banos, J. C. Arcos, O. Bautista, F. Mendez, E. A. Merchan-Cruz
Summary: This work investigates the hydrodynamics, concentration field, and mass transport of species under an oscillatory electroosmotic flow obeying a power law, taking into account the slippage effect at microchannel walls. Numerical results indicate that optimal conditions for mass transport of species can be promoted under slippage effects for different Schmidt numbers and Womersley numbers less than unity, with a maximum enhancement of two orders of magnitude observed for Wo>1. The analysis reveals a cross-over phenomenon in mass transport for different species, both Newtonian and non-Newtonian fluids, with significantly faster transport observed for shear-thinning fluids with slip at the microchannel walls.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2021)
Article
Physics, Multidisciplinary
Motahar Reza, Amalendu Rana, G. C. Shit
Summary: This study investigates the heat transfer characteristics of combined electromagnetohydrodynamic flow in a microchannel with regular wavy rough walls through a porous medium. The results show significant effects of parameters such as Hartmann number, Darcy number, and transverse electric field on velocity and heat transport. The study also examines the variation of mean velocity and heat transfer rate due to wavy roughness and magnetic field.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Mechanics
Mikhail S. Krakov
Summary: This study presents the results of a numerical simulation of two horizontal flows of miscible magnetic and non-magnetic fluids at low Reynolds numbers in a vertical uniform magnetic field. Four flow modes are found: the diffusion mixing mode with a flat diffusion front, the wave mode and two different plug flow modes.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Chemistry, Multidisciplinary
Chengfa Wang, Qi Gao, Yongxin Song
Summary: This paper investigates the electrokinetic effect at a two-liquid interface within a microchannel and explores the influence of surface zeta-potential and liquid phase height on the interface velocity. The results demonstrate that the direction and velocity of interface movement are determined by the zeta-potentials and height differences between the two liquids and the microchannel. This study has significant importance in understanding and manipulating fluid interface electrokinetic effects.
Article
Mechanics
A. Haque, A. K. Nayak, Bernhard Weigand
Summary: This article presents a mathematical study on electroosmotic flow of power law fluids driven by an external electric field, created by multiple wavy triangular modulated polarized wall hurdles in microslits. The study demonstrates that geometric modification and potential heterogeneity play key roles in enhancing mixing efficiency through fluid folding and stretching.
Article
Mechanics
Souradeep Roychowdhury, Rajarshi Chattopadhyay, Sandip Sarkar
Summary: The thermofluidic characteristics of a combined pressure-driven and electrical field mediated flow of immiscible Newtonian and viscoelastic fluids in a microchannel were analyzed in this study. The results showed that increasing the viscoelastic parameter enhanced the velocity, flow rate, and stress of the fluid. Additionally, it was found that Joule heating and viscous dissipation altered the temperature distribution and decreased the Nusselt number.
Article
Multidisciplinary Sciences
Mohit Trivedi, Neelkanth Nirmalkar
Summary: This article investigates the flow, ionic mass transfer, and ionic current rectification phenomena in a single conical nanopore with viscoelastic fluids. The results show that the extensibility parameter and Deborah number facilitate the ICR phenomena at high applied voltage, while the ICR phenomena are more pronounced at low values of kappa R-t.
SCIENTIFIC REPORTS
(2022)
Article
Mechanics
Priyanka Koner, Subrata Bera, Hiroyuki Ohshima
Summary: The time-dependent electroosmotic flow (EOF) and heat transfer of a generalized Maxwell fluid through a polyelectrolyte layer (PEL) grafted nanopore is studied, considering different permittivity between the PEL and electrolyte solution. The ion partitioning effects arising from the different permittivity are taken into account. Analytical solutions for the induced potential and fluid flow distribution are established, and the energy equations for hydro-dynamically fully developed flow with constant thermophysical properties are presented. The influence of several important factors on heat transfer behavior is investigated.
Article
Chemistry, Physical
Sujit Saha, Balaram Kundu
Summary: This study developed a new mathematical approach for analyzing the electroosmotic pressure-driven pulsatile-Oldroyd-B fluid flow between two parallel plates in microchannels under slipping actions on the wall surface. The results showed that the elastic nature of fluid increases the oscillatory behavior of flow velocity.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Physics, Multidisciplinary
Aaron D. Ratschow, Doyel Pandey, Benno Liebchen, Somnath Bhattacharyya, Steffen Hardt
Summary: Using unbiased ac fields can induce directional flows in nanopores, occurring at intermediate driving frequencies and dependent on the resonance of two competing timescales. This phenomenon could find application in controlling the translocation of small molecules or nanocolloids.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Iago Pereiro, Anna Fomitcheva Khartchenko, Robert D. Lovchik, Govind V. Kaigala
Summary: The WellProbe is a novel microfluidic concept that enhances sensitivity in immunoassays at low concentrations, increases information richness with different kinetic conditions, helps to estimate kinetic parameters, reduce washing steps and non-specific binding, and identify compromised results.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Mathematics, Applied
Alexis Bejar-Lopez, Cleyton Cunha, Juan Soler
Summary: This paper examines the interaction between microstructures and the appearance or persistence of singular configurations in the Cauchy problem for the two-dimensional model of incompressible micropolar fluids. Through integral techniques, the existence of weak solutions local or global in time is established, and the uniqueness and stability of these solutions is analyzed.
PHYSICA D-NONLINEAR PHENOMENA
(2022)
Article
Chemistry, Analytical
Mahdi Ahmadi-Motlagh, Younes Amini, Javad Karimi-Sabet
Summary: The study investigated the effect of initial feed concentration and migration distance on the efficiency of nitrogen isotope separation using ion-exchange chromatography. Results showed that a maximum separation factor of 6.616% could be obtained under certain conditions, and the separation factor slightly decreases with the ammonia concentration.
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
(2022)
Article
Engineering, Chemical
Hesam Salimi, Neda Hashemipour, Javad Karimi-Sabet, Younes Amini
Summary: In this study, three-dimensional stationary numerical simulations were conducted to gain a deeper understanding of gas mixture separation by the thermogravitational column. The behavior of the thermogravitational column was thoroughly analyzed to identify the optimum conditions and limitations of the process.
CHEMICAL PRODUCT AND PROCESS MODELING
(2023)
Article
Computer Science, Interdisciplinary Applications
Ali Heydari, Zahra Sayyah Alborzi, Younes Amini, Amin Hassanvand
Summary: The main contribution of this paper is to formulate the problem of optimal design for a renewable wind/solar/biomass hybrid system in Iran and compare the performance of genetic algorithm (GA) and particle swarm optimization (PSO) on this problem. The research on solar and wind hybrid energy systems is abundant, but research on solar/wind/biomass hybrid energy systems is rare. The study finds that the biomass/PV system is the most cost-effective for supplying the required load, and PSO outperforms GA in terms of results.
INTERNATIONAL JOURNAL OF MODERN PHYSICS C
(2023)
Article
Thermodynamics
Younes Amini, Amin Hassanvand, V. Ghazanfari, Mohammad Mahdi Shadman, Mehran Heydari, Zahra Sayah Alborzi
Summary: In this study, novel solvent extraction and microfluidic technology were combined to effectively separate and extract Ca2+ ions. A serpentine microfluidic device was utilized to achieve complete separation of aqueous and organic phases. The extraction performance reached 23.40% at a residence time of 4.2 s. Optimization using the Box-Behnken design approach yielded an extraction performance of 62.34% for Ca2+ under the optimum conditions of pH 6.25, DC18C6 concentration of 0.015 M, and aqueous phase flow rate of 20 mu l/min. The experimental efficiency and microfluidic extraction in the novel serpentine microchannel were found to be superior to similar studies conducted under the same conditions.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Nuclear Science & Technology
Valiyollah Ghazanfari, Morteza Imani, Mohammad Mahdi Shadman, Younes Amini, Fazel Zahakifar
Summary: In this study, the influence of twisted tubes and Al2O3 nanofluid on the thermal performance of the shell and tube heat exchanger was investigated using computational fluid dynamics (CFD). The results showed that using twisted tubes instead of smooth tubes increased the heat transfer coefficient by about 20% but increased the pressure drop by about 14%. Simultaneously using 20% nanofluid and twisted tubes resulted in an 8% increase in heat transfer coefficient and a 40% reduction in pressure drop compared to the old heat exchangers with various baffles. Therefore, the use of nanofluids and twisted tubes can enhance thermal performance and reduce economic costs.
PROGRESS IN NUCLEAR ENERGY
(2023)
Article
Computer Science, Interdisciplinary Applications
Younes Amini, Mohammad Mahdi Shadman, Valiyollah Ghazanfari, Amin Hassanvand
Summary: This paper aims to numerically simulate immiscible two-phase flow in different types of micromixers and investigate the effects of various parameters on droplet generation. The results show that modified micromixers can generate equidistant tiny droplets compared to ordinary geometry. Three different regimes were observed depending on the capillary number, and droplet size decreases with increasing capillary number. This study highlights the sensitivity of multiphase flows in micro-devices to even small changes in channel geometry.
INTERNATIONAL JOURNAL OF MODERN PHYSICS C
(2023)
Article
Multidisciplinary Sciences
Younes Amini, Valiyollah Ghazanfari, Mehran Heydari, Mohammad Mahdi Shadman, A. Gh. Khamseh, Mohammad Hassan Khani, Amin Hassanvand
Summary: This study analyzed the flow behavior of liquid-liquid extraction in a serpentine microchannel. A 3D model was used for simulation and the results matched experimental data. The effects of chloroform and water flow on the model were examined. The findings showed that at low and similar flow rates of both phases, a slug flow pattern was observed. However, as the overall flow rate increased, the pattern transformed into parallel plug flow or droplet flow. A higher water flow rate with a constant organic phase flow rate led to a transition from slug flow to droplet flow or plug flow. The study provides valuable insights into two-phase flow patterns in serpentine microfluidic devices and demonstrates the applicability of CFD simulation in investigating fluid behavior.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
F. Soleymani, M. H. Khani, H. Pahlevanzadeh, Younes Amini
Summary: A batch system was used to study the biosorption of strontium (II) on Sargassum sp. The combined effect of temperature, initial metal ion concentration, biomass treatment, biosorbent dosage, and pH on the biosorption of strontium on Sargassum sp was investigated using response surface methodology. The results showed that the biosorption capacity of the algae for strontium was 103.95 mg/g under optimal conditions (pH 7.2, initial strontium concentration 300 mg/l, and biosorbent dosage of 0.1 g in 100 mL metal solution). The experimental data fit well with the Freundlich model for equilibrium data and the pseudo-second-order kinetics model for biosorption dynamics analysis.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Azadeh Yarahmadi, Mohammad Hassan Khani, Masoud Nasiri Zarandi, Younes Amini, Ali Yadollahi
Summary: This study investigated the removal efficiency of Cerium (Ce(III)) and lanthanum (La(III)) ions from aqueous solution using Amberlite XAD-7 resin impregnated with DEHPA (XAD7-DEHPA). The optimal operating conditions were determined through response surface methodology based on the central composite design. The results showed that XAD7-DEHPA resin was effective in selectively removing Ce(III) and La(III) ions, with an adsorption percentage of 99.99% and 78.76% respectively. Langmuir isotherm model was found to best describe the equilibrium data, and the maximum adsorption capacity of the adsorbent was 8.28 mg/g for Ce(III) and 5.52 mg/g for La(III).
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Chemical
Ali Ghorbanpour A. Khamseh, Younes Amini, Mohammad Mahdi Shademan, Valiyollah Ghazanfari
Summary: This research investigates and optimizes the possibility of protonated orange peel to uptake thorium (IV) ions from aqueous solutions. The response surface methodology is used to assess the effect of variables and the validity of the quadratic model is verified. The optimal conditions result in a thorium (IV) uptake rate of 183.95 mg/g. The biosorption process reaches equilibrium after approximately 4 hours of contact, and the Langmuir isotherm describes the experimental data well.
CHEMICAL PRODUCT AND PROCESS MODELING
(2023)
Article
Engineering, Chemical
Zahra Sayyah Alborzi, Younes Amini, Parya Amirabedi, Saba Raveshiyan, Amin Hassanvand
Summary: Two types of hollow-fiber membrane contactors were used to separate CO2 from a gas stream using MEA absorbent. After validating the model with experimental data, the effects of various parameters such as gas stream velocity, absorption solution velocity, membrane porosity, and membrane tortuosity on CO2 removal efficiency, MEA concentration, and pressure drop were investigated. Increasing membrane tortuosity led to a slight decrease in CO2 removal efficiency, while increasing membrane porosity slightly increased the efficiency. However, increasing gas stream velocity significantly reduced the CO2 removal efficiency.
CHEMICAL ENGINEERING & TECHNOLOGY
(2023)
Article
Nuclear Science & Technology
Mohammad Mahdi Shadman, Valiyollah Ghazanfari, Younes Amini, Fatemeh Mansourzadeh, Armin Taheri
Summary: This study developed kinetic models for heavy water radiolysis, including segregated and lumped models. The concentration of radiolytic volatile species in the gas phase was calculated based on the liquid phase concentration. MATLAB ode15s was used as a solver for the stiff kinetic ODE equations. The models and solver were validated by comparing results with an existing code. The segregated model overpredicted the gas phase produced deuterium and oxygen compared to the lumped model, and the segregated model had regions close to critical concentration limits in the liquid phase.
NUCLEAR ENGINEERING AND DESIGN
(2023)
Article
Thermodynamics
M. Barzegar Gerdroodbary, M. Jafaryar, M. Sheikholeslami, Y. Amini
Summary: The impact of non-uniform Kelvin force on the thermal properties of ferro nanoparticles in heat exchangers is investigated using computational technique. The study reveals the influence of variable MHD on the hydrothermal characteristics of a screw heat exchanger with nanofluid flow. The findings highlight the significant role of geometrical parameter, Reynolds number and magnetic field on the thermal efficiency of the screw heat exchanger.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Ali A. Gh. Khamseh, Sohrab Ali Ghorbanian, Younes Amini, Mohammad Mahdi Shadman
Summary: The thorium uptake on immobilized protonated orange peel was studied, and the effects of biosorbent dosage, initial metal ion concentration, and contact time on the biosorption of thorium were analyzed. The biosorption capacity of the immobilized orange peel for thorium was found to be 18.65 mg/g at optimal conditions, and the biosorption process reached equilibrium after around 10 h of contact. The Langmuir isotherm showed better agreement in modeling the experimental equilibrium data, and the maximum absorption capacity of immobilized protonated orange peel for thorium adsorption was predicted to be 29.58 mg/g.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Azadeh Yarahmadi, Mohammad Hassan Khani, Masoud Nasiri Zarandi, Younes Amini
Summary: The aim of this study was to investigate the ability of AXAD-7 resin impregnated with CYANEX-272 to remove cerium and lanthanum ions from aqueous solutions. The prepared adsorbent material was characterized using FTIR, SEM-EDX, and BET methods. The impact of process variables including pH, adsorbent dose, and temperature on the removal of cerium and lanthanum ions was evaluated. The results showed that AXAD-7 resin impregnated with CYANEX-272 performed well in removing both cerium and lanthanum ions.
SCIENTIFIC REPORTS
(2023)
